Question

我有一个表值参数，我想加入，不只是一次，而是两次。一次得到一行，第二次得到父行。

我几乎可以肯定这可以用普通表来完成。可以用表值参数完成吗？

USE [ActivityStore_220.0_Model]
GO
/****** Object:  StoredProcedure [dbo].[SnapshotLineItemAggregations]    Script Date: 3/24/2017 5:49:43 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[SnapshotLineItemAggregations]    
    @billingCycleIteration int,
    @tableOfBusinessEntities [dbo].[BusinessEntityNode] READONLY,
    @tableOfActivityNames [dbo].[IdNamePair] READONLY
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    BEGIN TRANSACTION

    --Note this will ONLY delete items that have the exact same BillingCycleIterationId.
    --This will not delete old records from previous billing cycle iterations.  
    DELETE FROM [dbo].[LineItemAggregationSnapshot] WHERE 
    BillingCycleIterationId = @billingCycleIteration

    -- Insert statements for procedure here
    INSERT INTO [dbo].[LineItemAggregationSnapshot]
    SELECT [BillingCycleIterationId]
      ,[BillToAccountId]      
      ,CASE be_table.BusinessEntityTypeId WHEN 1 THEN 'Merchant' ELSE 'Organization' END AS [BusinessEntityType]
      ,[BusinessEntityId]
      ,[ProductId]
      ,[ActivityId]
      ,[RateProfileId]
      ,[Count]
      ,[Quantity]
      ,[ConversionRate]
      ,[OriginatingCurrency]
      ,[ConvertedQuantity]
      ,[QuantityUnits]
      ,[Rate]
      ,be_table.Name [BusinessEntityDescription]
      ,parent_be.Name [ParentBusinessEntityName]      
      ,activity_table.Name [ItemDescription]
      ,[LineItemData]
    FROM [dbo].[LineItemAggregation] lia
    LEFT OUTER JOIN @tableOfBusinessEntities be_table
    ON be_table.Id = lia.BusinessEntityId
    LEFT OUTER JOIN @tableOfActivityNames activity_table
    ON activity_table.Id = lia.ActivityId
    LEFT OUTER JOIN @tableOfBusinessEntities parent_be --the second join
    ON parent_be.Id = be_table.ParentId
    WHERE BillingCycleIterationId = @billingCycleIteration

    COMMIT TRANSACTION
    select * from LineItemAggregationSnapshot
    where BillingCycleIterationId = @billingCycleIteration
END

当我只加入@tableOfBusinessEntities时，我对这个存储过程没有任何问题。但是第二次尝试加入表值参数时，存储过程似乎不再起作用。

我没有收到错误，我尝试加入的每一列都显示为null，就好像连接行不再匹配一样。

Answer 1

所以，错误在我的代码中的其他地方。我是如何填充.NET DataTable的，或者更确切地说我是不是。

一旦问题得到解决，那么存储过程就像魅力一样。

因此，对于将来想知道的人的答案是肯定的，您可以多次连接表值参数，就像在SQL Server中使用普通表一样。

T-SQL存储过程连接表值参数两次

1 个答案: